What was the Inca's taxing system and how does it compare to our modern society?

Achemist mixes 4 liters of one acid solution with 10 liters of a 40% solution, resulting in a 30% acid solution. what is the value of x, the acid concentration of the first solution

Ayuda, para favor. correct incorrect

Oraciones write sentences using the information provided. use indirect object pronouns and the present indicative. make any necessary changes. modelo yo / no / decir / mentiras / a / mi / amigos no les digo mentiras a mis amigos. yo / pedir / dinero / a / ti la vendedora / mostrar / mucho / chaquetas / a / laura / y / a / mí ? quién / pagar / los estudios / a / manuel? nosotros / pensar / comprar / regalos / a / nuestro / madres